复制
1class Counter {
2	constructor() {
3		this.count = 0;
4	}
5
6	increment() {
7		this.count++;
8	}
9}
10
11const counterOne = new Counter();
12counterOne.increment();
13counterOne.increment();
14
15const counterTwo = counterOne;
16counterTwo.increment();
17
18console.log(counterOne.count);